Shoe-sole and method of laying out the same



H. J. TUINDER.

SHOE SOLE AND METHOD OF LAYING OUT THE SAME.

APPLICATION FILED NOV. 19, I918.

Patented Dec. 14, 1920.

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. The is UNlTED STATES PATENT OFFICE.

HENDRIK J. TUINDER, OF AMSTERDAM, NETHERLANDS.

Application filed November 19, 1918.

To all whom it may concern Be it known that I, HENDRIX JAoonUs f l v .lniNnnn, a sub ect of the Queen of the Netherlands, residing at Amsterdam, Netherlands, have invented certain new and useful Improvements in Shoe-Soles and Methods of Laying Out the Same, of which the following is a specification.

It is a well-known fact that foot-wear often causes deformities of the foot, and that in many cases wherein no deformities manifest themselves it misses its aim, which is to support the foot when the wearer of the shoe is walking.

Among the principal causes of the insufficiency of footwear is the form of the sole. In existing shoes it is not fully taken into consideration that the forefoot of the wearer should assume predetermined position relative to the heel and that the shoe should be so formed as to force the foot into this position.

In order to explain the novel shoe sole 1 will describe the usual method of designing a shoe sole, reference being had to Figure l, and then I will explain my novel method. This figure shows the circumference of a right sole with the usual auxiliary lines. The line AB, whose length is dependent upon the length of the foot, is called the divisional line between the second and the third toe, and forms the axis from which the various measures determining the breadth of the sole are taken. The point C is the so-called flexing point determined by the equation AC AB. Draw the line DE (the so-called ball-line) through C so that the angle EcB angle ACDzTO". The lengths CD and CE are equal to the one fifth part of the so-called ball gage, i. 6., the circumference of the foot measured over the ball.

Produce a line at right angles to AB and passing through the point L determined by the equation BL BA, so that LGzLH. ngth GH should be a predetermined part of the length AB, but for a correct understanding of the present invention the same is of no importance.

Finally, draw a line 1K at right angles to AB and passing through a point M determined by the equation LMzMB, so that MIzMK. The length IK (the so-called Width of the heel) is taken equal to the one fifth part of the heel gage, 2'. 6., the circumference of the foot over heel and instep Specification of Letters Patent.

Patented Dec. 14, 1920. eel-m1 No. 263,209.

and measured in the unloaded condition of the foot.

The points A, E, H, K, B, I, G and D thus obtained all form points of the circumfer ence of the sole, so that said circumference may be drawn by tracing a line joining said points.

lVith this usual method for determining the form of the sole, wherein the point B, 2 6., the heel center, as well as the points L4 and are in line with the points A and C, the position of that part of the sole which is in front of the ball-line DE is not sufficiently determined relative to that of the rear part, and especially that portion of the circumference which corresponds to the little toe, altogether depends upon the caprice of the shoe-maker and upon fashion. This primarily causes the heel to wear at the outside by which the foot-wear is prerented from touching the ground in the re quired manner and the foot assumes an undesired position when walhing. It is obvious that this fact prevents the foot from normally performing its function.

The present invention principally resides in soles so formed that the straight line joining the flexing point (C) and the heel center (B) does not coincide with the divisional line between the second and the third toe (AC), but forms with same an angle of 2 3 outward, and further that a point of the outside portion of the circumference of the sole is determined by the extremity of a line drawn from the flexing point under an angle of about with the divisional line between the second and the third toe and having a length equal to one half of the length of the ball-line (DE).

Reference is had to Fig. 2, illustrating a right sole designed in accordance with the invention in a similar manner as in F ig. 1, correspondin points in both figures being designated by the corresponding reference characters. The principal difference between the sole shown in 1 and that shown in Fig. 2 is that in the latter the line CB makes an angle of 2 3 with the line AC, and that one point of the circumference of the portion in front of the ball-line DE is formed by the extremity F of the line CF making an angle of 70 with the line AC. The further characteristic points of the circumference of the sole have C, the point M centrally between L and 13, whereas LGzLH and hlIzMK'. The lengths GI-I and J K are also determined as usual.

Moreover, Fig. 2 shows the lines E K and DI, and also lines drawn from E and D parallel to AC, the intersections of the latter with a perpendicular in A on AC being at and 0 respectively, whereas a line drawn through 13 at ri ht angles to A'C intersects the lines EIx and DI in the points p and g respectively. This circumference of the sole is preferably drawn in such a manner that it touches the line pg in B, the lines EK' and DI' in K and 1 respectively, the line D% in D, and the line With a view to the particular position of the rear of the foot relative to the forefoot as realized in foot-wear made in accordance with the invention it is necessary that the portion of the sole which supports the hollow of the foot be perfectly stiff as otherwise the foot would tend to fall down inward; a wooden arch support has proved to be very suitable.

If it is desired to make the shoe narrower than would be obtained on the basis of the above particulars preferably the points 02- and 0, according to the invention, are shifted inward through equal distances for instance, to n and 0' res )ectively. On the lines CD, CE and (Jh a length equal to the one fifth part of am is set oil from the points D, E, and F, thus producing the points cl, 6 and f. In a similar manner a length equal to the one tenth cart of Wit is set OH on the line MI and MK from the points I and K. If now the lines a'rZ, dj, jg. o'f, f0, els and 70 are drawn, another rectilinear figure is produced which is to inclose the circumference of the desired sole.

It will be understood that my invention may be applied to soles of various sizes.

lVhat I claim as my invention and desire to secure by Letters Patent is:

1. A shoe sole in which a straight line joining the flexing point and the heel center forms an angle of 23 outward with respect to the divisional line between the second and the third toe, and further, a point of the outside portion of the circumference forward of the ball line of the sole is the extremity of a line extending from the flexing point under an angle of about 70 with the divisional line between the second and the third toe and equal in length to one half of that of the ball line.

2; The method of laying out a shoe sole to fit the normal foot consisting in locating the usual divisional and ball lines, then drawing a line to serve as a true divisional line from the ball point at an angle of 2 or 3 outside the usual divisional line and on this true divisional line laying off the rear of the sole as usual, for the front of the sole draw ing a line at 70 to the front divisional line, making it equal in length to the outside portion of the usual ball line and pass the outside circumference of the sole through the end of this line.

In testimon Y whereof I affix my signature.

lENDRIK J. TUINDER. Witnesses:

D. KLYNE, M. ALVARADO. 

